HI,

I'm having some brake problems, I have no ABS since it is a RS model.

It seems like only one wheel is braking, so the car immediatly locks one wheel, and it get a little sideways, and brake perfoamnce is really poor.

I did a flush on the brake fluid, and same thing.

Next thing would be service the calipers, but what can it be? what should I check?

 

When you flushed the fluid did you see if fluid came out properly in that brake line when you hit the brakes?

 

well I didn't do it, but mechanic said everything looked fine.

 

Calipers could need rebuilt.

 

If a mechanic did it, why didn't he check the brakes? If you want to play with it yourself you need to take the wheels off and inspect the calipers, you should already know which one is working so look at the dicky one a d see if the caliper piston moves when you press on the peddle, don't push it all the way down and jam the calipers, you can easily lever the calipers back flush again, clean everything with brake clean